Turbine nozzle



M. SEDLMEIR Aug. 18, 1931.

TURBINE NOZZLE Filed Sept. 4, 192s H HH-TH H H v H U HH N w s E M n 0L ND R NE 0 W5 T T mm A H H wY M Patented Aug. 18, 1931 warren STATESPATENT; OFFICE MICHAEL SEDLMEIR, OE MULHEIM-RUHB, GERMANY, ASSIGNOR TOHOLZWARTH GAS TURBINE (70., OF SAN FRANCISCO, CALIFORNIA, A CORPORATIONOF DELAWARE TURBINE NOZZLE Application filed September 4, 1926. SerialNo. 133,568.

My invention relates to turbines and particularly to nozzles bywhich-the driving or motive fluid is directed against the turbineblades. Such nozzles have hitherto been made substantially straight withonly their ends deflected laterally. This straight construction of thenozzles is objectionable for several reasons. First of all, the materialis left relatively thin, particularly adjacent to the nozzle outlets,and it thus becomes very difficult to place the rivets by which theadjacent nozzles are connected with each other, and it is especiallyalmost impossible to apply rivets in the neighborhood of the nozzle 3outlets. Another difliculty is that there are certain limitations as tothe angle at which the motive fluid may issue from the nozzle, andparticularly it is practically impossible to have the fluid jets issueat a very flat or slight angle. Again, cooling of the nozzle andespecially its outlet portion, cannot be accomplished effectively. Mypresent invention provides a nozzle in which the main direction of theflow is not along a straight line but along a curved path, and thisenables me to so construct the nozzle that the rivets may be appliedquite close to the nozzle outlet, thereby obtaining a structure of verygreat strength. Furthermore, the fluid may be caused to issue at a veryflat angle. In addition thereto, the cooling of the noozle may becarried out efficiently even in the neighborhood of the noozle outlet.These and other advantages are secured by my invention, a typicalembodiment of which is illustrated by the accompanying drawings in whichFig. 1 is a partial section through a turbine nozzle ring embodying myinvention, said section being taken along a cylinder centered on therotor axis and substantially along the line 1-1 of Fig. 3-, and Figs. 2and 3 are partial sections of lines 22, 33 respectively of Fig. 1.

The improved nozzle ring construction consists of a lurality of cylinderelements A each of which has a fork A at one end projecting from thebody thereof to embrace a projection A at the other end of the adjacentmember or element. Rivets B may be passed through contacting portions ofthe forks A and projections A and, as shown best in Fig. 1, some ofthese rivets may be located quite close to the outlet end of the nozzle.Adjacent to each of the portions or projections A are located connectingprojections C, G through which a cooling fluid of any desired charactermay reach a cooling chamber D located adjacent to the nozzle proper, thenozzle channel E being formed between the members of the fork A and theprojection A That will be understood best by reference to Fig. 3. Findicates a carrier body or ring on which the nozzles are mounted.

The construction illustrated may be made of individual members made ofcast steel and they may be assembled without any permanent connection,the riveting taking place subsequently. It will be seen readily that theangle at which the driving fluid issues from the nozzles may be madevery flat if desirable, and yet the rivets may be located quite close tothe nozzle outlets and the cooling chambers D may be extended quiteclose to the nozzle outlets so as to secure an efficient cooling action.If the cooling medium employed is air, theaction is improved to such anextent that a much smaller amount of air need be employed when the airis injected or forced through under pressure, or I may even dispensewith the injection of air and rely simply on the entrance of atmosphericair into the cooling chamber. .Another advantage of the new constructionis that it permits the nozzle surfaces to be given a very high polish soas to reduce their resistance to the flow of the motive agent and thusminimize friction losses. The new nozzle is also much more durable thanthose employed hitherto, and will not warp during cooling.

Various changes in the specific forms shown and described may be madewithin the scope of the claims without departing from the spirit of myinvention.

I claim:

1. A turbine nozzle ring comprising a. plurality of connected elementseach of which is composed of a body member having a pair of parallelfork members projecting from one end thereof, said fork members beingspaced in a radial direction with respect to the axis of the nozzlering, said body member at its opposite end being provided with notchesintowhich the fork members of the adjoining element fit, whereb a nozzlechannel defined by said body mem er said fork members and the rear endof. formed, said bod member being hollow, and conduits for con ucting acooling medium to and withdrawing the same from the interior of saidmember.

2. A turbine nozzle ring comprising a plurality of connected elementseach of which is composed of a body member having a pair of parallelfork members projecting from one end thereof, said fork members beingspaced in a radial direction with respect to the axis of the nozzlering, said body member at its opposite end being provided with notchesinto which the fork members of the adjoining element fit, whereby anozzle channel defined by said body member, said fork members and therear end of the adjoining element, is formed, said element being hollowat least in part to provide a cooling space adapted to have a coolingmedium circulating therethrough.

3. A turbine nozzle rin comprising a plurality of elements each 0 whichis composed of a body member having a pair of parallel fork membersprojecting from one end thereof, said fork members being spaced in aradial direction with respect to the axis of the nozzle ring, said bodymember at its opposite end being provided with notches into which thefork members of the adjoining element fit, whereby a nozzle channeldefined by said body member, said fork members and the rear end of theadjoining element, is formed, said body member being hollow, andconduits for conducting a cooling medium to and withdrawing the samefrom the interior of said member, said elements being riveted to eachother through the ends of the fork members and the rear end of theadjoining element interfitting therewith.

In testimony whereof I have hereunto set my hand.

MICHAEL SEDLMEIR.

he adjoining element, is-

